Re: [9fans] Van Jacobsen's network stack restructure

[Aki M Nyrhinen <anyrhine@cs.helsinki.fi>]

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On Thu, Feb 02, 2006 at 05:43:49PM +0000, quanstro@quanstro.net wrote:
> On Thu Feb  2 11:57:10 CST 2006, forsyth@vitanuova.com wrote:
> > yes, i supposed it could be something along those lines but i didn't make my point clear.
> > if it is along those lines, it breaks something that even sockets didn't break.
> > at the moment, i get a file descriptor that i can pass to anything that does read and write.
> 
> definately not true on linux. udp and netlink sockets would be a counter example.

sorry, are you claiming that the attached program (horror.c) does not
work on (some) linux?

this is what in my understanding VJ's stuff would break.

	Aki


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#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int
main(void)
{
	int fd;
	struct sockaddr_in sa;
	sa.sin_family = AF_INET;
	sa.sin_addr.s_addr = htonl(0x7F000001);
	sa.sin_port = htons(5555);
	switch(fork()){
	case 0:
		fd = socket(PF_INET, SOCK_DGRAM, 0);
		bind(fd, (struct sockaddr*)&sa, sizeof sa);
		dup2(fd, 0);
		execl("/bin/cat", "cat", NULL);
	default:
		fd = socket(PF_INET, SOCK_DGRAM, 0);
		connect(fd, (struct sockaddr*)&sa, sizeof sa);
		dup2(fd, 1);
		execl("/bin/cat", "cat", NULL);
	}
	return 0;
}